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Name: John L.
Status: Other
Age: 40s
Location: N/A
Country: N/A
Date: September 12, 2002


Question:
Dear Sir or Madam,

The nrcan.gc.ca web site states that Mount Logan is the highest point in Canada. However, its elevation go from 5950 to 6050 meters depending on WHAT the points of reference were used and HOW the survey was done. My question is WHAT are the different points of reference against which elevation in Canada are measured??
Is it not that elevations aren measured against mean sea level which is a UNIVERSAL figure or is mean sea level country specific?
Finally what are different ways to survey the elevation of a mountain?



Replies:
The standard way of measuring the height of is to measure the change in the force of gravity at the mountain top and the bottom of the mountain. With the advent of ground positioning satellites, this has changed, and the altitude is measured by the time difference at the mountain peak and base. You can find out the details at:

http://classic.mountainzone.com/everest/science.stm#top

Vince Calder



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